My friend and I hacked the iR port so it was a bit more beefy, then I would use it to mess with the tv's in the classrooms.

oh, and I did some cool constructive things with it too.

I did quite a bit of this too. The cool thing is that HP only limited the receiver, so transmit range was quite high for IR remote control and such. I also programmed a basic Tic Tac Toe game that used IR, and discovered you could aim 3 HP48s just right to get an odd 3 player game. After that, I made a full battleship game that worked really well.

I think I did more programming on that device then I did work in Calculus. But I still managed to pass with a college credit under my belt, so I guess I did enough